fix: accesslog handler does not contain information about authenticated subject if present on errors

[dadrus]

closes #141

[codecov]

Codecov Report

Merging #162 (160f488) into main (5a1125b) will increase coverage by 0.01%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
+ Coverage   85.82%   85.83%   +0.01%     
==========================================
  Files         147      147              
  Lines        5630     5635       +5     
==========================================
+ Hits         4832     4837       +5     
- Misses        673      674       +1     
+ Partials      125      124       -1     

Impacted Files	Coverage Δ
...al/fiber/middleware/accesslog/accesslog_handler.go	75.36% <33.33%> (-1.21%)	⬇️
internal/x/tracing/provider/instana/logger.go	75.00% <0.00%> (-25.00%)	⬇️
internal/rules/repository.go	97.60% <0.00%> (+3.19%)	⬆️

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